Kincaid’s lupine (Lupinus oreganus), a rare legume found in prairies and oak savannas, is listed as threatened by the US Fish and Wildlife Service and the Oregon Department of Agriculture, and endangered by the Washington Department of Natural Resources. Extensive land development and alteration in the prairies of western Oregon and southwestern Washington have relegated remaining populations to small, isolated patches of habitat. The historic habitat of L. oreganus may continue to become more inhospitable given that climate models predict temperature increases and decreased precipitation in the Pacific Northwest. We used an experimental common garden to test for interactions between genotype and microclimate to identify management considerations which may be necessary for long-term adaptation to climate change. Treatments included ambient (no treatment) and experimental manipulations of the microclimate to simulate cooler (shading plots) and hotter (warming plots) temperatures.